JP6188386B2 - Shed buffer structure - Google Patents

Shed buffer structure Download PDF

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JP6188386B2
JP6188386B2 JP2013081001A JP2013081001A JP6188386B2 JP 6188386 B2 JP6188386 B2 JP 6188386B2 JP 2013081001 A JP2013081001 A JP 2013081001A JP 2013081001 A JP2013081001 A JP 2013081001A JP 6188386 B2 JP6188386 B2 JP 6188386B2
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top plate
polyurethane foam
shed
reinforcing bar
reinforcing bars
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JP2014202019A (en
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吉智 大宮
吉智 大宮
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イノアック特材株式会社
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本発明は、ロックシェッド又はスノーシェッドの頂板上に緩衝層を積層したシェッドの緩衝構造に関する。   The present invention relates to a shed buffer structure in which a buffer layer is laminated on a top plate of a rock shed or a snow shed.

近年、海岸道路や山沿いの道路では、道路や車両を落石から保護するためのロックシェッドや、積雪から保護するためのスノーシェッドが設けられている場所がある。
また、前記シェッドの頂板を保護するため、頂板上に緩衝層を設けることが行われている。頂板上に設けられる緩衝層は、頂板の強度面から緩衝層自体の重量を軽減するため、重い砂に代えて軽量な発泡体が用いられている。
前記発泡体をシェッドの頂板上に設ける緩衝構造として、発泡ポリスチレンのブロックを頂板上に載置するもの（特許文献１）、あるいは頂板上にポリウレタン発泡原料を吹き付けてポリウレタン発泡体を頂板上に形成するものがある（特許文献２）。 In recent years, on coastal roads and roads along mountains, there are places where rock sheds for protecting roads and vehicles from falling rocks and snow sheds for protecting against snowfall are provided.
In order to protect the top plate of the shed, a buffer layer is provided on the top plate. As the buffer layer provided on the top plate, a lightweight foam is used instead of heavy sand in order to reduce the weight of the buffer layer itself from the strength of the top plate.
As a cushioning structure in which the foam is provided on the top plate of the shed, a polystyrene foam block is placed on the top plate (Patent Document 1), or a polyurethane foam raw material is sprayed on the top plate to form a polyurethane foam on the top plate. (Patent Document 2).

しかしながら、発泡ポリスチレンのブロックを頂板に載置する構造にあっては、発泡ポリスチレンのブロックが衝撃等によって頂板からズレやすい問題や、施工時に発泡ポリスチレンを頂板のサイズや不陸等に応じて加工しなければならず、加工に時間と手間が掛かる問題などがある。
一方、頂板上にポリウレタン発泡原料を吹き付けてポリウレタン発泡体を頂板上に形成する構造にあっては、頂板上に形成したポリウレタン発泡体が、発泡後の収縮等により反り上がったり、衝撃等によりずれたりするおそれがある。 However, in the structure in which the expanded polystyrene block is placed on the top plate, the expanded polystyrene block is easily displaced from the top plate due to impact, etc., and the expanded polystyrene is processed according to the size and unevenness of the top plate during construction. There is a problem that processing takes time and labor.
On the other hand, in a structure in which a polyurethane foam is formed on the top plate by spraying a polyurethane foam raw material on the top plate, the polyurethane foam formed on the top plate may warp due to shrinkage after foaming, or may be displaced due to impact, etc. There is a risk.

特開２００４−０３６２６６号公報JP 2004-036266 A 特開平１０−２６６１３８号公報JP 10-266138 A

本発明は前記の点に鑑みなされたものであって、シェッドの頂板上にポリウレタン発泡体を施工性よく形成することができ、かつ頂板上に形成したポリウレタン発泡体にずれや反りを生じにくいシェッドの緩衝構造の提供を目的とする。   The present invention has been made in view of the above points, and can form a polyurethane foam on the top plate of the shed with good workability, and the polyurethane foam formed on the top plate is less likely to be displaced or warped. The purpose is to provide a buffer structure.

請求項１の発明は、シェッドの頂板上にポリウレタン発泡原料を吹き付けてポリウレタン発泡体を前記頂板上に積層したシェッドの緩衝構造において、前記頂板上面の複数箇所に鉄筋を立設し、前記頂板上に突出した鉄筋と交差するように補助鉄筋を固定し、前記頂板上に突出した鉄筋と共に前記補助鉄筋を前記ポリウレタン発泡体に埋設したことを特徴とする。 According to a first aspect of the present invention, in the shed cushioning structure in which a polyurethane foam raw material is sprayed on the top plate of the shed and polyurethane foam is laminated on the top plate, reinforcing bars are erected at a plurality of locations on the top plate, Auxiliary reinforcing bars are fixed so as to intersect with the reinforcing bars protruding to the top plate, and the auxiliary reinforcing bars are embedded in the polyurethane foam together with the reinforcing bars protruding on the top plate .

請求項２の発明は、請求項１において、前記鉄筋の上端位置は、前記ポリウレタン発泡体の発泡後の上面位置と等しいことを特徴とする。 The invention of claim 2 is characterized in that, in claim 1 , the upper end position of the reinforcing bar is equal to the upper surface position of the polyurethane foam after foaming.

請求項３の発明は、請求項１又は２において、前記頂板に隣接する地山部分にも前記鉄筋を立設し、前記頂板から該頂板に隣接する地山部分に渡って前記ポリウレタン発泡体を積層し、前記頂板から突出した鉄筋及び前記地山部分から突出した鉄筋を前記ポリウレタン発泡体に埋設したことを特徴とする。 The invention of claim 3 is the invention according to claim 1 or 2 , wherein the reinforcing bar is also erected on a ground mountain portion adjacent to the top plate, and the polyurethane foam is spread from the top plate to the ground mountain portion adjacent to the top plate. The reinforcing bar is laminated, and the reinforcing bar protruding from the top plate and the reinforcing bar protruding from the ground are embedded in the polyurethane foam.

請求項４の発明は、請求項３において、前記地山部分では前記頂板部分よりも前記鉄筋の下端が深く埋め込まれていることを特徴とする。 The invention of claim 4 is characterized in that, in claim 3 , the lower end of the reinforcing bar is embedded deeper in the natural ground portion than in the top plate portion.

請求項１の発明によれば、頂板上面の複数箇所に立設された鉄筋が、頂板上面のポリウレタン発泡体に埋設されているため、ポリウレタン発泡体のずれや、ポリウレタン発泡体の発泡後の反りを鉄筋によって防ぐことができる。   According to the invention of claim 1, since the reinforcing bars erected at a plurality of locations on the top surface of the top plate are embedded in the polyurethane foam on the top surface of the top plate, the polyurethane foam shifts and warps after foaming of the polyurethane foam. Can be prevented by reinforcing bars.

請求項１の発明によれば、鉄筋に該鉄筋と交差するように補助鉄筋を固定し、前記鉄筋と共に補助鉄筋をポリウレタン発泡体に埋設したことにより、ポリウレタン発泡体のずれやポリウレタン発泡体の反りに対する防止効果をさらに高めることができる。特に鉄筋に交差して設けられた補助鉄筋は、ポリウレタン発泡体の反り防止に効果が高い。 According to the first aspect of the present invention, the auxiliary reinforcing bar is fixed to the reinforcing bar so as to cross the reinforcing bar, and the auxiliary reinforcing bar is embedded in the polyurethane foam together with the reinforcing bar, so that the polyurethane foam is displaced and the polyurethane foam is warped. Can be further enhanced. In particular, the auxiliary reinforcing bars provided so as to cross the reinforcing bars are highly effective in preventing warping of the polyurethane foam.

請求項２の発明によれば、頂板の上面に立設した鉄筋の上端位置が、ポリウレタン発泡体の発泡後の上面位置と等しくされているため、頂板上面にポリウレタン発泡原料を吹き付けてポリウレタン発泡体を順次積層して形成する際に、ポリウレタン発泡体の仕上げ高さ（厚み）を把握し易く、施工作業が容易になる。 According to the invention of claim 2 , since the upper end position of the reinforcing bar erected on the upper surface of the top plate is equal to the upper surface position after foaming of the polyurethane foam, the polyurethane foam material is sprayed onto the top plate upper surface. When the layers are sequentially laminated, it is easy to grasp the finished height (thickness) of the polyurethane foam, and the construction work is facilitated.

請求項３の発明によれば、頂板に隣接する地山部分にも鉄筋を立設し、地山部分に積層したポリウレタン発泡体にも鉄筋を埋設したため、地山部分でもポリウレタン発泡体のずれや、ポリウレタン発泡体の発泡後の反りを防ぐことができる。 According to the invention of claim 3, since the reinforcing bars are erected in the natural ground portion adjacent to the top plate and the reinforcing bars are embedded in the polyurethane foam laminated on the natural ground portion, the displacement of the polyurethane foam is also observed in the natural ground portion. Further, warping after foaming of the polyurethane foam can be prevented.

請求項４の発明によれば、地山部分では頂板部分よりも鉄筋の下端が深く埋め込まれているため、鉄筋が地山から抜けるのを防ぐことができ、頂板に比べて柔らかい地山部分においてもポリウレタン発泡体のずれやポリウレタン発泡体の発泡後の反りを効果的に防ぐことができる。 According to the invention of claim 4 , since the lower end of the reinforcing bar is buried deeper than the top plate part in the natural mountain part, the reinforcing bar can be prevented from coming out of the natural mountain part, and in the soft natural mountain part compared to the top plate. Also, it is possible to effectively prevent the polyurethane foam from being displaced and the warping of the polyurethane foam after foaming.

本発明の一実施形態におけるシェッドの緩衝構造を示す断面図である。It is sectional drawing which shows the buffer structure of the shed in one Embodiment of this invention. 同実施形態におけるポリウレタン発泡体の積層前を示す断面図である。It is sectional drawing which shows before lamination | stacking of the polyurethane foam in the same embodiment. 図２における頂板上面を上方から見たＡ矢視図である。It is the A arrow directional view which looked at the top plate upper surface in FIG. 2 from upper direction. 補助鉄筋の他の例を示すＡ矢視図である。It is A arrow line view which shows the other example of an auxiliary reinforcing bar.

以下、本発明におけるシェッドの緩衝構造について、図を用いて実施形態を説明する。図１に示すシェッド１０は、山沿いの道路５０に形成されたロックシェッドあるいはスノーシェッドである。シェッド１０は、地山部分５１側に立設された道路擁壁１３と、道路５０の谷側の縁に立設された柱１５とによって頂板１７が支持されている。前記頂板１７は、波状鋼板の上面にコンクリートが打設されて構成されている。前記頂板１７の厚み（高さ）の例として、５０〜１００ｃｍを挙げる。また、前記頂板１７の上面には、プラスチックシート等からなる防水層（図示せず）が敷設されている。   Hereinafter, embodiments of the shed buffer structure according to the present invention will be described with reference to the drawings. A shed 10 shown in FIG. 1 is a rock shed or a snow shed formed on a road 50 along a mountain. In the shed 10, the top plate 17 is supported by the road retaining wall 13 erected on the natural mountain portion 51 side and the pillar 15 erected on the edge of the valley of the road 50. The top plate 17 is configured by placing concrete on the upper surface of a corrugated steel plate. Examples of the thickness (height) of the top plate 17 include 50 to 100 cm. A waterproof layer (not shown) made of a plastic sheet or the like is laid on the top surface of the top plate 17.

前記頂板１７の上面及び該頂板１７に隣接する地山部分５２の上面には、所定間隔で鉄筋２１が立設されている。前記鉄筋２１は、所定の径及び長さ（高さ）の鉄の棒からなり、図２及び図３に示すように、前記頂板１７及び該頂板１７に隣接する地山部分５２の上面における縦方向（道路の幅方向）ａと横方向（道路の長さ向）ｂに、それぞれ所定間隔で立設される。前記鉄筋２１の例として直径１０〜１９ｍｍ、長さ５０〜１５０ｃｍを挙げる。好ましくは異形鉄筋がよい。また、前記縦方向ａの間隔ｃ及び横方向ｂの間隔ｄの例として、５０ｃｍ〜５００ｃｍを挙げる。特に後述のポリウレタン発泡体３１が設けられる範囲において、前記頂板１７の谷側の縁及び前記地山部分５２の山側の縁近く、例えば縁から５０ｃｍ以内の部分には前記鉄筋２１を立設するのが好ましい。なお、図示の例では、前記鉄筋２１は、谷側に傾斜した前記頂板１７及び地山部分５２の上面に対して垂直方向に立設されているが、前記頂板１７及び地山部分５２の上面に対して垂直に限られず、上下方向（例えば路面に対する垂直方向、鉛直方向）であってもよい。   Reinforcing bars 21 are erected at predetermined intervals on the top surface of the top plate 17 and the top surface of the ground portion 52 adjacent to the top plate 17. The reinforcing bars 21 are made of iron bars having a predetermined diameter and length (height), and as shown in FIGS. They are erected at predetermined intervals in a direction (road width direction) a and a horizontal direction (road length direction) b. Examples of the reinforcing bar 21 include a diameter of 10 to 19 mm and a length of 50 to 150 cm. A deformed reinforcing bar is preferable. Examples of the distance c in the vertical direction a and the distance d in the horizontal direction b are 50 cm to 500 cm. In particular, within the range where the polyurethane foam 31 described later is provided, the reinforcing bars 21 are erected near the valley side edge of the top plate 17 and the mountain side edge of the natural mountain portion 52, for example, within a portion within 50 cm from the edge. Is preferred. In the illustrated example, the rebar 21 is erected in a vertical direction with respect to the top surfaces of the top plate 17 and the natural ground portion 52 inclined to the valley side. The vertical direction is not limited to the vertical direction (for example, a vertical direction or a vertical direction with respect to the road surface).

前記鉄筋２１の下端の埋め込み深さ、すなわち立設深さｅ，ｆ（図２に示す）は、前記頂板１７の部分よりも地山部分５２で深くされ、前記頂板１７よりも柔らかい土で構成される地山部分５２において、後述するポリウレタン発泡体３１の反りを起こす応力やずれを起こす応力によって鉄筋２１が地山部分５２から抜けるのを防止している。前記鉄筋２１の立設深さｅ，ｆの例として、前記頂板１７部分の深さｅを５〜２０ｃｍ、地山部分５２の深さｆを［頂板１７部分の深さｅ＋１０〜５０］ｃｍとする例を挙げる。   The embedding depth of the lower end of the reinforcing bar 21, that is, the standing depths e and f (shown in FIG. 2) is deeper in the ground portion 52 than the top plate 17 and is made of softer soil than the top plate 17. In the natural ground portion 52, the reinforcing bars 21 are prevented from coming out of the natural ground portion 52 due to stress that causes warping or displacement of the polyurethane foam 31 described later. As an example of the standing depths e and f of the reinforcing bars 21, the depth e of the top plate 17 portion is 5 to 20 cm, and the depth f of the natural mountain portion 52 is [depth of the top plate 17 portion e + 10 to 50] cm. Here is an example.

前記鉄筋２１には、後述のポリウレタン発泡体３１に埋設される位置、すなわち前記頂板１７及び地山部分５２から突出した部分に、前記鉄筋２１と交差するように補助鉄筋２５が固定されている。前記補助鉄筋２５は、前記鉄筋２１に対して十字形となるように針金や溶接等で固定される。また、個々の鉄筋２１に固定される補助鉄筋２５は、図３のような１本に限られず、図４に示すように、１本の鉄筋２１に対して２本の補助鉄筋２５、２５を、例えば前記縦方向ａ及び横方向ｂとなるように固定してもよい。前記補助鉄筋２５の例として、直径１０〜１９ｍｍ、長さ３０〜１００ｃｍを挙げる。好ましくは異形鉄筋がよい。また、前記鉄筋２１に対する前記補助鉄筋２５の高さ位置は、前記頂板１７及び地山部分５２から突出した鉄筋２１の部分における上端と下端間の中間位置付近が好ましく、例として突出部分の下端（頂板１７及び地山部分５２の上面）から３０ｃｍの位置を挙げる。なお、図示の補助鉄筋２５は、前記鉄筋２１毎に別個のものを使用しているが、複数の鉄筋２１に１本で掛け渡すことができるような長いものを使用し、長い補助鉄筋を縦方向と横方向に格子状に組み合わせて複数箇所の前記鉄筋２１に固定してもよい。   An auxiliary reinforcing bar 25 is fixed to the reinforcing bar 21 so as to intersect the reinforcing bar 21 at a position embedded in a polyurethane foam 31 described later, that is, a portion protruding from the top plate 17 and the natural ground portion 52. The auxiliary reinforcing bars 25 are fixed to the reinforcing bars 21 by wire, welding or the like so as to have a cross shape. Further, the number of auxiliary reinforcing bars 25 fixed to each reinforcing bar 21 is not limited to one as shown in FIG. 3, and two auxiliary reinforcing bars 25, 25 are provided for one reinforcing bar 21 as shown in FIG. 4. For example, the vertical direction a and the horizontal direction b may be fixed. Examples of the auxiliary reinforcing bar 25 include a diameter of 10 to 19 mm and a length of 30 to 100 cm. A deformed reinforcing bar is preferable. Further, the height position of the auxiliary reinforcing bar 25 with respect to the reinforcing bar 21 is preferably in the vicinity of the middle position between the upper end and the lower end of the reinforcing bar 21 protruding from the top plate 17 and the natural ground portion 52. As an example, the lower end ( A position 30 cm from the top plate 17 and the upper surface of the natural ground portion 52) is given. The auxiliary reinforcing bars 25 shown in the figure are separate for each of the reinforcing bars 21, but long ones that can be spanned over a plurality of reinforcing bars 21 are used. You may fix to the said reinforcing bar 21 in multiple places combining in a grid | lattice form to a direction and a horizontal direction.

前記鉄筋２１が立設された頂板１７及び地山部分５２の上面には、図２に示すように、ポリウレタン発泡原料３１Ａを吹き付け、該ポリウレタン発泡原料３１Ａを発泡させてポリウレタン発泡体の層を形成し、その上に再びポリウレタン発泡原料３１Ａの吹き付け及びポリウレタン発泡体の層形成を行い、これを所定回数繰り返して、前記頂板１７及び地山部分５２の上面に前記ポリウレタン発泡体の層を順次積層し、最終的に図１に示すような所定厚み（高さ）のポリウレタン発泡体３１を形成する。その際、前記ポリウレタン発泡体３１の仕上げ高さ（最終高さ）が、前記頂板１７及び地山部分５２の上面から突出している前記鉄筋２１の上端位置と一致するように、前記ポリウレタン発泡原料３１Ａの吹き付け及びポリウレタン発泡体の積層を行う。また、前記頂板１７及び地山部分５２の上面に複数のポリウレタン発泡体の層が積層される際に、前記頂板１７及び地山部分５２から突出している前記鉄筋２１及び前記補助鉄筋２５がポリウレタン発泡体３１に埋設される。前記ポリウレタン発泡原料には、公知の硬質ポリウレタン発泡体用の原料が用いられる。なお、前記頂板１７の上面の谷側先端には、ポリウレタン発泡原料の流出防止用に止め擁壁１９が立設されている場合がある。   As shown in FIG. 2, a polyurethane foam raw material 31A is sprayed on the top surface of the top plate 17 and the natural mountain portion 52 where the reinforcing bars 21 are erected, and the polyurethane foam raw material 31A is foamed to form a polyurethane foam layer. Then, the polyurethane foam raw material 31A is sprayed again and the polyurethane foam layer is formed again, and this is repeated a predetermined number of times, and the polyurethane foam layer is sequentially laminated on the top surface of the top plate 17 and the ground portion 52. Finally, a polyurethane foam 31 having a predetermined thickness (height) as shown in FIG. 1 is formed. At that time, the polyurethane foam raw material 31 </ b> A is made so that the finished height (final height) of the polyurethane foam 31 coincides with the upper end positions of the reinforcing bars 21 protruding from the top surfaces of the top plate 17 and the ground portion 52. Spraying and laminating polyurethane foam. Further, when a plurality of polyurethane foam layers are laminated on the top surfaces of the top plate 17 and the natural ground portion 52, the reinforcing bars 21 and the auxiliary reinforcing bars 25 protruding from the top plate 17 and the natural ground portion 52 are polyurethane foamed. Embedded in the body 31. As the polyurethane foam raw material, a known raw material for rigid polyurethane foam is used. In some cases, a retaining wall 19 is erected on the top end of the top surface of the top plate 17 to prevent the polyurethane foam raw material from flowing out.

その後、前記ポリウレタン発泡体３１の上面にコンクリート保護層３５が設けられる。このようにして構成されたシェッドの緩衝構造は、前記ポリウレタン発泡体３１に対して発泡後の収縮応力が働いたり、反りを起こす応力が働いたりしても、前記頂板１７及び地山部分５２から突出している前記鉄筋２１がポリウレタン発泡体３１に埋設されているため、前記ポリウレタン発泡体３１のずれや反りを防ぐことができる。しかも、前記鉄筋２１に交差するように固定された補助鉄筋も前記ポリウレタン発泡体３１に埋設されているため、ポリウレタン発泡体３１のずれや反りに対する防止効果をさらに高めることができる。   Thereafter, a concrete protective layer 35 is provided on the upper surface of the polyurethane foam 31. Even if a shrinkage stress after foaming acts on the polyurethane foam 31 or a stress that causes warping is applied to the polyurethane foam 31, the shed cushioning structure constructed in this way is from the top plate 17 and the natural ground portion 52. Since the protruding reinforcing steel bars 21 are embedded in the polyurethane foam 31, the polyurethane foam 31 can be prevented from shifting or warping. Moreover, since the auxiliary reinforcing bars fixed so as to intersect the reinforcing bars 21 are also embedded in the polyurethane foam 31, the effect of preventing the polyurethane foam 31 from being displaced or warped can be further enhanced.

さらに、前記地山部分５２では前記頂板１７の部分よりも前記鉄筋２１の下端が深く埋め込まれているため、前記ポリウレタン発泡体３１に発泡後の収縮応力が働いたり、反りを起こす応力が働いたりしても、前記鉄筋２１が地山部分５２から抜けるのを防ぐことができ、前記頂板２１に比べて柔らかい地山部分５２においても前記ポリウレタン発泡体３１のずれや反りを効果的に防ぐことができる。   Furthermore, since the lower end of the reinforcing bar 21 is embedded deeper in the natural ground portion 52 than in the portion of the top plate 17, shrinkage stress after foaming acts on the polyurethane foam 31, and stress causing warping acts on the polyurethane foam 31. Even so, it is possible to prevent the reinforcing bars 21 from coming off from the natural ground portion 52, and to effectively prevent the polyurethane foam 31 from being displaced and warped even in the soft natural ground portion 52 compared to the top plate 21. it can.

１０ シェッド
１７ 頂板
２１ 鉄筋
２５ 補助鉄筋
３１ ポリウレタン発泡体
５２ 頂板に隣接する地山部分 10 Shed 17 Top plate 21 Reinforcement 25 Auxiliary rebar 31 Polyurethane foam 52 Natural ground part adjacent to top plate

Claims (4)

シェッドの頂板上にポリウレタン発泡原料を吹き付けてポリウレタン発泡体を前記頂板上に積層したシェッドの緩衝構造において、
前記頂板上面の複数箇所に鉄筋を立設し、前記頂板上に突出した鉄筋と交差するように補助鉄筋を固定し、前記頂板上に突出した鉄筋と共に前記補助鉄筋を前記ポリウレタン発泡体に埋設したことを特徴とするシェッドの緩衝構造。 In the shed cushioning structure in which the polyurethane foam is laminated on the top plate by spraying a polyurethane foam raw material on the top plate of the shed,
Reinforcing bars are erected at a plurality of locations on the top surface of the top plate , the auxiliary reinforcing bars are fixed so as to intersect with the reinforcing bars protruding on the top plate, and the auxiliary reinforcing bars are embedded in the polyurethane foam together with the reinforcing bars protruding on the top plate . A shed buffer structure characterized by that. 前記鉄筋の上端位置は、前記ポリウレタン発泡体の発泡後の上面位置と等しいことを特徴とする請求項１に記載のシェッドの緩衝構造。 The shed cushioning structure according to claim 1 , wherein an upper end position of the reinforcing bar is equal to an upper surface position of the polyurethane foam after foaming . 前記頂板に隣接する地山部分にも前記鉄筋を立設し、前記頂板から該頂板に隣接する地山部分に渡って前記ポリウレタン発泡体を積層し、前記頂板から突出した鉄筋及び前記地山部分から突出した鉄筋を前記ポリウレタン発泡体に埋設したことを特徴とする請求項１又は２に記載のシェッドの緩衝構造。 The reinforcing bar is also erected on a ground part adjacent to the top plate, the polyurethane foam is laminated from the top plate to the ground part adjacent to the top plate, and the reinforcing bar protruding from the top plate and the ground part 3. The shed cushioning structure according to claim 1 , wherein a reinforcing bar projecting from the embedment is embedded in the polyurethane foam . 4. 前記地山部分では前記頂板部分よりも前記鉄筋の下端が深く埋め込まれていることを特徴とする請求項３に記載のシェッドの緩衝構造。 The shed cushioning structure according to claim 3 , wherein a lower end of the reinforcing bar is embedded deeper in the natural mountain portion than in the top plate portion .
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